Power press



R- THoMsoN E'r AL POWER PRESS 3 Sheets-Sheet 1 ATTORNEYS Nov. 11, 1930. R,v THOMSON ET AL 1,781,038

POWER PRESS Filed DSC. 21. 1927 3 ShBGtS-Sheet 2 xNvENTORS Poker! Tamson /l//red Marr/s 7710/716027 ATTORNEYS Nov. 1l, 1930. R. THOMSON ET AL, 1,781,038

POWER PRESS Filed Dec. 2l, 1927 3 Sheets-Sheet 3 INVENTORS /Fober 7770/115021 /QzWSLM ATTORNEYS Patented Nov. 11, 1930 Y* p Y 1,781,038

' l Roeien-T1 cenni/reen Aim Aaeeanironmswiioireon,

Powiinmsless Application il'ed December '21, Y1'9'27. Serial 110.241,555. :l j

Y An iriiportgant'objeetof the present 'invenlooatedbetweeii and-'are veit'io'ally -v i Y tion `is to provide iinprovedineans for -drivspaced, apart. 1 p v Y ing the rain of a power press and controlling Akil/'lthin yits upper Aand lo'wer'enfdsithebear# its movements. The inventionrelates.parfv ing block 7 is Q'orined vwith cylindrical bear- -5 tioularly toa press of the flexible :power ing 'surfaoesfQ -ivh'ose Centers V'are in vertical 55 type. In such apressthepressure of therein alii/lement. jA bushing lO'is mounted to turn is under zthecontrol of the operator and may within the upperfbearingsurfaoe, and a bushi- Y loe varied at `willduring the `working stroke *ing 11 `is 'Inountedft'o 'turn 'within the lower' of the rain, according to the requirements of bearing surface. Screws-12 are screwed into /O the work which is bei-ng performed Y the front f ,the bearing lollook 'and extend v6G Another important ob'eot'of the invention into,`peripheral grooves '13 --foifn'ed in the is to `provide improved means rior movi-ng the two bushings. These' "screws `hold the loush ram upon its return stroke and forfautornatiings against eiidwise ;displaoeinet lout jpe'r# cally controlling said `return movementshin mit their; "t0 Ur't'ate ilejely in t'lielbearing a'inanne'rto prevent shockand injuryltothe bl'k. rrlliejuipjperfloiisl ngflOkjhas a gear e5 20 Fig. l Yisa side elevationpartly Vin section 'l'g 'internally he'ad'edas ttl and vfthe l' .'Fig a top plan view of the uppe'rmiric-V y ,Tlbsligsl@"and 11 supportthegpress- .tion brake; Y v l v Y j 'rain 19; l Thsgifam 'comprises an elongated k Fig. l a section taken on the `line 4.4; of VSllll'"20'-W`h-'0l1','is' fthr'eade'd vas at lfroin'a 75 pig 1; point adgaeejnt its lower enlfnpvardly for Fig. `5 a diagrammatic view "of the press "substantially fits" lengt-11.4' Above 'its Operated for a Working Stroke of Vthe mm; "threaded portion the -sli'ankQO is reduced in .and Y Y v v cr'oss-'seoti'onjand'formed with longitudinally Fig; 6 a ldiagrainrnatie` view of the 'press @intending-ribs orsp'linesQQ. 'plih'e'lowefr "end 8o 'A operated for `a'retnrn stroke ofthe-rain. O' theshairkis and'lias'atoo'lhead Y Referring bynuineralstotlie various parts, swiveledlupon 'Thetoo'l'fhead'is'prothe press includes a traine structure oompris- "vided with the' usual sooketfto :reeeivega 'tool ing la base l and a column 2 rigidlyseoured shank,aiidgwithafset screw to'holcltlielatter i e to the Abase `at the rear of theplatt'er. l-The in a socket;"Q ,A-liall'bearing 24 is interposed `85 'forward Vportion of the -base vformgfa support vl?tfwe'e'vn"'the lov'ver end ofthe shank 20 and'V for a wo1ktab1e 3,- whichV is providedl with vthetool'headso'that saidpar'ts niay turn -iire'e- Vthe 'usual yslot for holding ya suitable y work ly relatively to .eah other even when subjectsupport.;gTh-e column structure =is hollow7 ed tofpressur'e. Thethreadetl lowery portion' Y l 10 being orined'fby front and rear-upstanding `-of therimisthr'eaded through the lowerhush- 90 `channel irons 4l and side Vvplates seouredjto king' '11 and its reduoediupper 'portion passes l:the channel irons and also to the base. The /throu'ghjthe upperibushing'lO. The reduced lside plates extend Iforwardto form spaced portion lhas .a 'longitudinalsliding `fit'vvithin' xarins disposed above the work ,table 3. kSethe upperjbushing'and the latteris locked to' Y cured between the'outer endsothe arinsf 'rotate with :the rain -b-'y engagement ofthe 95 and -invertialfalinernent with the Center'fof "splineslQQ in 'th'eke'yways i8. Avloallvbea'ring the table 8V, is'arhollow bearing block 7 for 25 4is`inte'rp'osedhetween thel upper end-ofthe shiiftably .supporting the press rain. Two floushinglland anabutinent-Q foifined-inthe lbearings 8 uare mounted Vupon there'ar side bearing block, to 'receivean `'eildwi's`e"upward .fro'f'thebearing blook'f"Theseloearings are thrustltrltnsinittedtofsaid bushing'bythefrain.

i fijas i f `VRearwardly of thebearingblock a horizontal disposeddrive shaft 27 extends .through y the column2 and ismountedjtorrotate in bearings 2(8fsecured'to `the frontand rear-Walls `of jthefcolumn. fixedbeltpulley 29 and a loose 1 4pulleyv() are mounted upon the'shaft'27 back ofthe column,` and a bevel fdrivepinion Slis fixed to' the 'forward end 'of thefshaft The pinionl -has driving connections VYyvisththe ram supporting bushings1,0A and ll through a differential gear" mechanism `Which'is located inthe space between'the bearings 8.*"iflll1is mechanism includes an .outer bevel gear 32 which meshes With the driver pinion 31.r he Y gear 32 is in the formofa: ring and carries tgvo stub' shafts 'which vextend 'radially inward at Y diametrically opposite pointsand havefint'erl `mediate` "bevel p'inionsy 83 mounted to rotate uponth'em'.V A'bevel followergear 34' meshes with the upper sides Yof the pinions 33 andV is l fixed tothe lower end of ashaft ',Syyhicvh exi i .tends upwardandiismountedvto rotate in the uppefr 'b'earing' 8@ A"V similar bevel follower .l gear v34a Vmeshes lwith'the loiverjsides-of the pinions 33is `rtd the upperend of a rvvhich entends'A dovvnwvardV and mounted torotate in the lower/bearing 18.

'Vhicli is''ifiXedftor the :'shaft@ @11d flisl1-es:y th fthe blllshingl gearlvl4'. #1n thefpresent instanceA Y thesetivojgears are off'ithefs'ame-sifze. If'llie l'orver vshaft 36 extendsbelowitsibea'ring' and ilia"Sa-igear iXedto' itfalnd meshing y with the l' bushing gearl fordrivingthe low erbushingy lll. LIn the present instance thelovver bushing. gear l5 iis larger-than the upper gear'l4 and vThe rotation' .of the upper shaft 35 isl conf- Lfofthelo'wer' shaft 36 lis controlled by; a Y fri@ tion brake 40.l The upperbrakeSQcomprises 'abrakedrumBQar-liiied to the's'h'aft 35,4 and a `IAcontracti'ngbrake bandfLSQP :enoircling'thfe' 1 Y providedtvitha frictionlining and anchored atene end as 39Ato thepress flfgrme. `iSi-mil'arlythe -lowerfbrake 40con`iprisesja y brake drum 40e; fixed A to the Shaft .gegane a Y' 4linin contractingband 401? provided *With* a friction andV anchored loneendjto press vi frame Aas at 40C; o

Rotatably supported by the "basevovf, the press frame* isla horizontal rock`shaft4lzgand 4.lined to'V` said shaftisa treadle 4'2fWhioh eX; tends forwardly to apOi/n't infront *ofthe base.

f The shaft 41 extendsoutfbeyond 'o'neside:of ,Y the base and/has a lever43 fixed toit and eX-. tending forwardly and rear- Wardlyftherefrom. M Mounted upon the rear end-kof the leverf43for I .longitudinal adjustment thereon is a weight L 44."A reach rodf45-ispivotallyeonnected tot t'he forward end offthelever 43 and ventends vupward to La* point adjacent theupper end of .the'press frame, said upper end being pivot-V ally connectedto k the outwardlyextending .Y

thisfarm tothepfree endof the brake band 39". Y-

.arm ofa bell cranklever 46.V The lever 46 is pivotal-ly mounted uponthe side 'of thefframe 'Vandhas an upwardly extending arm. -A pull rod 4'? operatively connects the upperend Vof A rock lsha'ftz48 isi rotatably mounted in,Y t albearing 49 secured upon the front Iof the f column `V2 andl adjacent thelovver brake 40Y Fixed to one/end of Vtheshaft48 is a rear-A wardly extending crankfarm '50 located out# VvWardly from the pressy frame and upon the saine side thereof as the lever 48. Alever 51 s i* is pivo-ted `at thejone'end vto a' bracket arm `52 which is lsecured to the foryvardend voffs@` one` of the frame 'farms Gand eXten'd's; a ma`l pterial:distanceabiovethe frame. From its i `point of'attachmentl tothe bracketarm the lever 5l extends rearwardly, across the upper y, i

end oftheA press ram, tofa point in'fgvertical" .alinenient with'therrearjend'ofthe crank VarmO.V vertical reachjfjrodispivotally Y 'connected to the lever 4,3111;y appoint between the roclziyfshaft 4liand'the Weight 44.` V'Tliis rod extends'upward'and is operatively con-` sections which' are threaded 'and lconnected buckle V54 to provide-'for the adj'us-tment'fof the length of the rodbetweenthecrank armV v'Assnming that the driving power isl applying foot pressure totheltrea'dle, 42.130`

again'sttthe resistance of theweiglit 44.1. `The snafu-48 andthe crankv arm 55. are thereby Y s Y o infected; to -the 'cranl-arnr 50'and to :the rear f endof the level` 515x Therod 53 is made in togetherabovef'the crank arm 50xbyxa turn- .andtheleverlggand the proper lpositioning of Vthe latter With relation Vto the upper end oflthe ram', fora purpose'whichvvillQpresent- `1 ly'-ap'pear.` Fixed-to the rockfshaft 48, vat 2100 5 the-zoppositefendfthereoffrom-'the cranlral'fm` i fly-and hasl anr4 operativel connection 156 `With n n V`the free end. ofthe brake ban'd40b "ofthe l'oWer brakeA'IO.v v'

:applied to vthefmai'n drive shaft 27 and that lthe ram is elevated, thepress isoperate'dfby forward end offsaidy lever then exerts adownvWardpullk upimv the 'reachjrod 45 andf'rocks the bellfcranlr'jlever 46 to contract ythe brakeVK 'band 39h about 1thedrum 39a' for brake appliaA l cation of greater'- for less f degreev dependent upon! the amount of-pressure applied'tothe l ftr'eadle, f The roeking'of the lever 5437by foot` Y :pressureyalsocauses an'upwardthrustftobe Y. transmittedthrough the"reac'lr,'ro'd -tov-theqjiz. Ycrank armO. Therrank-armbO, thefrook` 'rocked to expand the bralreba'nd 40?4 and re-f lease the-'lower ybrake 40. vThus there is a ffrictionalresijstance applied to A thershaft 35,`

leadi ngupward: from the ydifl'erential which endsw 1,1.;01deeshaft., the 'gear 37,111@ gear 14' and'thefupp'erfbushingll()a'gai-nstf-rota- Y v tion. The d oyver A-bralnyf40, is,hovvever;l ref rapidly retracted. i

msi-,eas

shaft 27 is.transmitted` through the difieren;

rotation of the threaded bushing llwill `cause an endwise movement of the rain',` and the upper portion thereof will slide through the bushing 10. The relationship between the threads 2l of the ram and the direction of rotation ofthe drive shaft'27issuchA as tocause the ram to descend toward the work table.

When the ram has brought the tool int-o contact with the work its pressure may be varied to suitthe requirements by vvarying the pressure upon the treadle 42. A relatively light pressure upon the treadle will cause only a light application of the upper brake and will permit the brake drum 39a to slip when the desired light pressure has been applied through the tool in the head 523,

f'thereby stoppingthe downward feed move@ ment of the ram. `The application of s'uiicient pressure to the treadle 42 to strongly apply the brake 39 and positivelyfhold the shaft 35, the bushing lOand the ram against any rotation will give the threading bushing l1 its maximum vvfeeding power and cause a powerful pressure upon the work. Many different degrees of pressure are obtainable by merely varying thev pressure upon the treadle. This Gives 'the' pressA maximum b power flexibility. i.

To cause the retraction of the ramirom the Work the operator mere'lyremovesv his foot from the treadl'e. Theweight 444 then rocks the lever43'to exert an upward thrust upon the reach rod 45'and a downward pull upon the rod- 53 to automatically release the upper brake 39 and apply thel lower brake 40. The application ofthe lower brake causes the threaded bushing to be heldl against rotation while they release of theupper brake permits, the bushing 10,' to beturned' Ifreely. by the power from the shaft 27'received through the diferentiaL'the shaft 35 and thegears 37, and 14. lThe rotation of the bushing 10 causes the ram to rotate and' screw upwardly through the held bushing Il, the upper portion of the ram sliding through its driving bushing 10. The gears 37 yand 14 ar'eof'the same size sothat theram Vwill be rotated at the same speed as theshaft'3j5 andwill be Itis most desirable 'that' the, return movement of. the ram beA limited in a manner to avoid shockto the press. In thepresenti apparatus lI have providedjfor. an automatic cut-off of the return driving power from the ram when the latter reaches. a certain'point in yits return stroke. l TheV lever 5l extends across the path of'movement ofthe ram' `and is provided with'an abutment member 51aL which is in apositionto bei struck the upper end of the ram. lBymeans of the turnbuckle 54 the position of the lever 51l is' ade l.justed so that the raml will' contact with the abutment 5la near theupp'erfen'd of its stroke;

l/Vhenthisv contacthas been made and thev ram continues its-upward movement the lever Y 5l isrocked upwardly thereby 'exertinga pull 'upon the reach rodh 53 which rocks the lower lever 43 against the resistance of the weight 44 and also rocks the crank arm 50 to release the lower brake '40. This movement of the lower lever 43 exerts: a pullthrough'the reach rod45 which rocks the bell crank46toapply 'the upper brake 39. The. application ot'v the brake 39 stops the rotation of the shaft 35, the gear 37 and the bushingl() andhaltsl the upward movement of the ram. .Theramf is thus automatically stopped witlioutimp'aet and without shock to the press structure.

1. In power press,A a shiftably mounted ram; adifferential gear mechanism; l adrive element operatively connected toy saidzmechianism; a driving connection between one: side of the differential mechanism and said ram.1 to

move the latte-r 7Ona working stroke; a driving connection betweenV the opposite 'side of ythe diderential mechan'isml and the ram lto move theram on a return' stroke; means tocontrol the movements of? the ram; and automatic means kto render sai-d return'- driving connection inoperative and limit the extent o the 'returnfstrokeof the ram.` l v 2. In a power press; ashiftablymounted ram; a differential" gear mechanism; means to drive saidmechanism;ja driv'ingc'onnection between the dilierential mechanism and the ram to movethe latteronaiworking stroke; adriving connection between said vmer'zhanism andthe ramto movethe latter vupon a :return stroke; automatic' means' to render said return driving connection infl operative" andv limit 'theextent oi. the return stroke of theram; and means operable'af-twill y to vary the-pressure of thefram'on'itslveorling stroke;

3. In a power press,'a shiftably mounted ram; a differential gea-r mechanism; a drive element Voperatively connected tov said mechanism; a driving: connect-ion between one? side of the differential"mechanism vand said-"ram to move the'latter on:V a working-stroke; a

driving connection betweentheopposite side ofthe differential mechanism andthe ram to move said ramA on ka return stroke; a brake to control said 'working stroke driving connection;v a brake to control said return` stroke driving vconnection ;A and means-tio alternately operate said brakes forV controlling the move# ment/sof the ram; 'i

4. In a power'press5'a-shiftably mounted A ram; adiiferential gear mechanism;v a drive elementoperatively connected to said 'mechamsm ;r a'drlvmgconn'ection between2 onelside vof the differential' mechanism land saidA ram i to'an'oveY` the-latterfon faQ-fworkingistroke;. a v driving conneetion 1betWeentheopposite side Y myesaiid 'rain onajreturnstroke; Y control said Working stroke driving, yc onne'ci Vtion;*abrake yto Aco'ntrolfsaid retuingstrolfre ldrivingl ,mechanismg' means -to- :operate said v brakes.at Willffreo'ntrolling the movements return:stroke:0f-theram,v 1 a 'fj- 5.3In'sa 'power ypressya ram provided; With a l'shank threaded for a portiongof its length -;Vr

'i of the ram and varying-itslpressure upon the working stroke ;and, automatic means; to operate the brakesjfor limiting'the extent- -of the an internally threaded bushing engaging fthe Y threaded'portion of' said Vpresser?shank; ia

bushing'engaging the unthreaded portionroffv the shank,'formedto permittheshank to slide shaft; andfmeshing With the vvgear npon the threaded; bushing asecond shaft operatively connected tothe. Oppositesdeeftlwdierentiallmechanism a gearfixed torotate with rsaidv Seeded Shaft and'mellllsswth the gell upon the other bushing ja frictiongbrake to operateupon thelirst shaft; brake i to/operateuponzthefsecond shaft; means opv. erable'- 'atqvvillg to releaser `the ,irstbrake and 'applyfthejv secondbrake for .rotating the --threaded bashing, holding c the vother bushing" againstfrotationland lcausing the ram :to

VAmake aiy longitudinal ,Working stroke; means f-'operable afterthe y.releaseof said last'me'ans .to applythe iirst Vbrake and releaselthesecond Vbrake for causing a return stroke` ofthe ram;

and vmeans automatically opferatedbythe re-` N.turn movementlof-the rainftojreleasethe first Y brake, apply the second brake and limit the i6, 1n afp'owerpress;a vr3am? prnvidedj'W,ith a lShank threaded for a portioniof its' length Shanks Y i formedito permitit; to Y slide 'thereth roifigh; @means j' rotatably.v supporting :said bushings f and holding vthem against vrendrvise move i meiitpa driving connection forrotating the rotating theother bushing; driving meanslto independently drive said drivingconnections A and Vthereby jlnove theflrani upon' a Wrkingl stroke and uponareturn Stroke; and means In a power Press ai ramqfhrefl a of theother. bushingg:

V.taneously 'alternating the operation ofthe two bralesf* Y an internally:threadedb'iishinglengaging the Lfthradedi .portion Off Seid; Y'.Sllfa'lk bashing engaging-the unthreaded vportion. o the .fixedgto ,rotate Ywith `the,latter @and i' threaded-bushing a drivingfconnection `for portion kof `its length ;r internally .threaded bushing engagingthe thi-feadedaportionofthe ram ;',a'bu shing engaging the unthreaded p'or-u tion of theram iXedj torotateWiththev latter an'd'formed to permit itto slide therethrough means 1f rotatably: 'Supporting .:Sady bushigs and holding themagainstendiifise movement g.

edbushing; a driving connectionforrotating the other :bush1ng; a friction brake to con! the rotation of `the fthreade'dfbushing; l1 and a friction 'brake .tor "controlY the .rotation prisin'g: a reciproca? bleram; rotatable'meansfor moving'the rain A. onl its Working stroke; rotatablenieansfor 1 i nfiovingk the Vram onits return stroke; arditiierentlall gearm'echanism connected to saidY ently; a frictionbrake for locking the'ram-r .returning'means tocausefa- Working stroke;

-a frictionbr-ake for lockingthe means for fmoving the rain on its Working stroke tol v cause' a .return stroke; yandineans :for simul-A "rani on its Working stroke rotatable means orrotatmg the ramand moving itjon itsl a. drivingfqonnectionfor rotating said threadj W two rotatable means to rotate them "independ- A,.poyver pre'ssf comprising a@ recipro? cable ram; rotatable :nieansffor movingthe return'stroke'; a differential gear mechanism connected k to said ytwo rotatable means; to. j

rotate them independently; a friction ybrake for lockingthe ram-returningmeans to cause a Working stroke; la frictlonlbrakeior lock# ing1the means lfor moving the ram o nfits tvorking stroke tQfCauSe a return stroke 5 'and means for simultaneously alternating the :operation ofthe'two brakes tohol'dfthefram against -rnotati onY on "its vvorkingstroke and ,to causey itto rotate von its 'return stroke.: "y: 'l

l lO'A power press ycompri'sing la recipro# Cable ram rotatable {means for' moving: the 1 ram on g-ltsv Working stroke;frotatable means for moving the ram oni itsfre'turn'strokeg means for independently andjdil'lerentially .driving saidtwo rotatable means 'Whereby'the lrainwi'llfloe moved greater speed on its return stroke thanA on its Working stroke a .frictionlbrakegfor the ramreturning mecha- V "nisrn'ya` friction brake for theV fn'echan'isml3 formoving the fram' oli-fits Working stroke; and means Vfor simultaneously"alternatingv `the operationvk of the t'vvo brakes. l

'11.' Af power :press Comprising a reciprocable ram rotatable'means'for movingthe ra1n on its Working stroke; rotatable means ,for movingv the ram on'jitsreturn stroke; a' differential gear mechanism; connected to saidtwo rotatable means; a vfriction brake for" lockingthe rainy-returning means; a fric-"5:51 ktion brake for v lockingthe.. '1 neans for moving the on itsY Workingj 'stroke;v means y'for siin'ultaneousl5'f` alternating, the .operation Aof the' tw'obrakes;Y and' means -g operated by' the, 13o

f fl 5) (il) n ram on its return stroke to arrest thewoperation of the ramreturning mechanism. .K

12. A power press comprising a reciprocable ram; rotatable means for moving the ram on its working stroke; rotatable means for moving the ram on its return stroke; a differential gear mechanism connected to said two rotatable means .to rotateA them independently; means to lock the ram-returning mechanism during the working stroke of the ram; and means to vlock the mechanism for moving the ram on its working strokeduring the return movement of theram;v 13. A` power press comprising a reciprocable ram; rotatable means formovingt'he ram on its working stroke; `rotatable means for moving the rain on its return stroke; a differentialgearmechanism connectedto said two rotatable means to rotate themhindependently means for simultaneously.A Vlocking the ram returning mechanism'andreleasing the mechanism for driving the ram On its working stroke 4and forl simultaneously locking the mechanism for moving the ramV on its working stroke and releasing 'the mechanism for moving vthe 'ram'4 on its return stroke. Y 14.A power presscomprising a reciprocable ram; rotatable meansfor moving the ram on its working stroke; rotatable ymeans for moving the ram on its return stroke; a dierential gear mechanism connected to said two rotatable means; meansfor simultaneously locking the rame-returning mechanism and releasing the mechanism fory driving'the ram onits working strokeand for simultane- VAnism and releasing the mechanism ordriving theramV on its, working stroke .and for simultaneously locking, the-*mechanism for moving the ram on its working`-vstroke and releasing the mechanism for moving the ram on its return stroke; and means operated by the ram for arresting the movement of the ram-'returning mechanism,

16. In a mechanical tool apparatus, a toolho'lding member threaded for' a portion of its length an internally threaded bushing engaging the threaded portion of said tool holder; a; bushing engaging. the unthreaded portion of the holder fixed to rotatewith the latter and formed to permit it to slide' therethrough;

means rotatably` supporting Asaid bushings and holding them against endwise vmove-vk ment; a driving connection for rotating said threaded'bushing; a driving connection for rotating the other bushing; a friction brake rto control the rotation or" the threaded bushing; and a friction brake to control the rotav tion of theother bushing.

17., ln a mechanical tool apparatus; are- 4ciprocable tool-holding member; rotatable means for moving'sai'd tool' holder on' its working stroke; rotatable means for moving the holder upon itsl returnv stroke; mechanism connected to saidrtwo rotatable means to ro- .tatevthem diflerentially; abrake to lock kthe means for moving thelivolde'r upon vits working stroke; a brake tolock said holder-re vturning means; .and means' operated by the `holder upon itsv return 4stroke to.- automati- Ically release the first'biakefandapply the second brake to limit `the returnfstroke.

18. ii a mechanical ltool apparatus; :a Vreciprocable tool-'holding` member; rotatable means forV moving saidL `tool holder lon its working stroke; rotatabley means for moving the holderz upon its return stroke ;,me chanism Vconnected to saidtwo'rotatable means toro-v 4 tate them-ii'idependently ;k 'a braketo lock'r the g means for moving the holderuponi its" wfork- 9 ing strokeja brake toulockA saidholder-re! 'turning means; and means operated'by the holder upon its return stroke to automatically apply 4the second r brz'tker to: limit vthe return stroke. V 'Y 19. lna inechanicaltnol apparatusfawre'- ciprocable tool-holding member rotatableV means for moving vsaid tojlV holdervon'its working stroke; rotatable meansfor moving;

the holder on'its return stroke; mjechaiiism,Y

connected tosaid two .rotatable means tero-v means for moving the holder upon itsworking stroke; a" `brakel to lock said holder-returning means; foot-operated means to release. the first brake and applywthe second to cause a working strokeof the holder; and

means to' 4automaticallyfapply the lirst brake and release the second brake to' causea return vstroke fof the V'holder vn'flie-n operatedineans is released.-

tate them independently; Va brake to lock the` l i 20. lnV a mechanicaltool apparatu`s;'a recipi'ocable f toollliolding finember rotatable means zfor movilngsaid toolliolder on lits working' stroke 5' rotatable means forincving.

the vholder on its return. stroke; mechanism connected to said two 'rotatable means to ro- Y vtate themv independently; brake to lock the means for moving the holder uponits working stroke; a brake to lock said; lijolde'rere .turning means ;`V foot-operated means, to re- 19.215@ the rSt brake. and apply. theseead to cause a working strokeot theliolder; means to automatically apply-theffirst-brake and release the second Vto cause a returnsti'oke 1 'holder 'o'nfit'sy Working stroke. l

' @eine Home whennmifwpefetsa;maffe isreleased and means operated by thejholder.

' :upon its'freturn'stroke-to',antomatieally re# .leasefjth'e first bralieoand' a'pplyjthe' second 5 Vbrake 'tolimit lthe return stroke. o

' f 2L In armeehamcal toolapparatus, a ren' :'eprocably'mounted tool-holding member; a

differential geary meehan'ism; adrive element operatively `com'iec'te'd to fsaid mechanism g a d Y the, dierential'mechanisni andjthe" tool' '1'5' .holder to move the latteron avreturn stroke;

A a brake to 'control said Working strokediv-A 'e ing'zeonnection'; la brake tocontrol "saidv return 'stroke driving connection ;i- .alnd means ,y vto alternatelyoperate Vsaid brakes to cause.

20 e reciproeationof the E holde'rbj7 fill@ i differenr 7tial mechanismrand said drivingconnections and varly f at vvWil-ltliefrpressurei'of fthe tool f 5225111 amechanicalftool apparatusfa rei' vciprocablymninted toolholding member; ro-

tatable tool-advancingmeans for moving said tool holder on its Working strokeyrotatalole 3o mechanism ya" driving connection betweenl one side' of said dierential'meohanisnrandthej f VVs'tool-eadvz'incingl means; a drivingjeonnection vvbetween Ythe oppositefside'ofthe differential 'mechanism' and YtheV Atool-'retra'eting means;

Y.: aameans to; lock` the saidtool-advancing 19ans 'o to cause it to vfr0-Ormai@ Ywith the tool-femingmean'g; means-5to lock-the said tool-re ,y "tractingmeans to cause it to co-operate with y, the'said tooladvancing means;l and means Y 40 VforA simultaneously alternating lthe Ylocking l f of one; andthe. releasing voftheother of said i `two looking I'neans,V andjvarying at Wllrthe i pressnregofkthef toolholder .y on its Working stroke.

Y, lrotatable meansVK for moving saidV tool holder pngasworking; Stroke.; rotatable means" Vfor -a driving connection.betweenltheopposite side ofthe differential mechanism and the Y means for: movingthefholder' on a/return strokeV and Aook-operate with the mechanism tocanse'arvvorking stroke; means to lock the [varyingv at fWill the j press'iir ltoolretractingi,means for movingfgsaid tool Y Y l ",holder on ltsreturnfst'roke; adlf'f'erential gearV `i' i 23. n'a mechaniealtool fapparatiispa re-V eiprocably mounted l tool-holding member ;r l

ffmovingltheh'older-on a return stroke; a dif'- 'fftool-r'etracting means; means to lock the i meanslfor moving the holder on a'vvorking. 4strokefandfeo-operate With the driving meehanism to cause av v:return stroke; means. for simultaneouslyalternating theV operation 'of theftwvo locking means; andmeans to atomatically apply thefirst lockingmeans and release o the stagna .1o-@king means t ttjfli:

the return' stroke of the holder, j j

QLLI'In amechaniealtoolgappfaratumafre- Y v rotatable tool-advancing means Ifor moving ,l

saidftool `,holder on Vits Working strolegro- :u

tatablev 'tool-retraeting means for moving Hsaid 'toolh'older on' i its return stroke ;k a "diff ferential gear mechanism; a driving 'conneejtionbetweenJone'sidefof saidj` difliehtenjtialYj4 n v'I'r-iecha'nism andthe tofolfadvancingY means;

"a-drivin'g, connection between thegopposte :sidef'of the differntialjinechanism andthe.,

fto'ol-retracting means; means to lockthe said .tool-'advancing means toi-,canse it"` to; colopvfrele'asi'n'g 'the tooladvancingfmeans l' holder on Y its VWorkingV strok :eratingjnantomaticallyju' thef releasefjof i .they v said manually operablel means jtof look .v ,the tool-advancing means tool-retractin g o means. a,

n 25'.; ln a mechanical .to

' tionbetween V.one side voffsaid A,differentialj *mechanismjandsaidftool-advan'cingmeans; fa driving connection' betweenYthe opposite 1 side ofthe differential^V inec'hanism'l and" said tool-retraeting means imeansto loellthesaid :tool-advancing means; to canse it y to.u col-opferatewvith the tool-retracting means; means- '.to" lock `vthe :sai-'d toolretracting to f1 `'cause itvto cooperatewith the said tool-ad-V vancing lmeans; Y,manually "oper'ablefmea-ns for flocking the 1 tool-retracting lmeans` andV releasing. the tool-adVanoning means Y andY o varying at .'Will ther-pressnre Vof;L Vthe `tool Y` -hol'der on *its WorkingE .s'tro'kegV means :oper-1' ating automatically-uponlthernease ffnief said' `Vmam'i'ally operable e means: kto lo'ck the toolfadvancing means andfto release the tool# retractingymeans;:and means adapted to be and' 'to' releas'efthe j e vol apparatus; aires,

ciprocabl'y mounted' toolholdingvinember;` frotatable' tool-advancingmeans y.for moving '.said' tofolfholder on itsworkring.strokeyrotatable lt-oolfretraotingr'means Y for' moving fsaid tool fhpljder on its retiirn ystroke 'g' Aaf difn operated 'byfthe tool holderon its. retnrn n ing means* and release the* tool-advancing holder.

T(,:iprocably mounted VYtool-h'o'ldingl V4member a differential; gear amechanism;fa drive ele-f rment operatively connected to ysaid mechastroke tofautomatcallylock the tooli'retra-ct-` 26. In a mechanical'toolapparatus, a"

lau

' means to limltthexretnrn stroke rof theftool s las anism and the tool holder to move the latter on a return stroke; brake means for controlling said working strokedriving connection; brake means for controlling 4said return stroke driving connection; means for' alternately operating said two brake meansto cause reciprocation of the holder by the differential mechanism and said driving connections; and means whereby the tool holder will be retracted at a. higher speed than its movement onv its working stroke.

27. ln a mechanical tool apparatus, a reciprocably mounted tool holding member; a differential driving mechanism; a driving connection betweenone side of said differential mechanism and the tool holder to shift the latter upon a working stroke; a driving connection between the opposite side of the differential mechanism and thetool holder to shift the latter upon a return stroke; brake means to control said working stroke driving connection; brake means to control said return stroke driving connection; meansv to alternately operate said two brake means to cause the tool holder to reciprocate; and

means to cause the tool holder to rotate upon one of its strokes.

28. In a mechanical tooll apparatus,a reciprocably mounted tool-holding member; a differential driving mechanism; a driving connection between one side of'said differential mechanism and the tool holder to shift the latter upon a workingstroke; a driving connection between the opposite side of the differential mechanism and tliertool holder to shift the latter upon a return stroke; brake means to control said working stroke driving Y connection; brake means to control said returnV strokedriving connection; means to alternately operate said two brake means toy cause the tool holder to reciprocate; andy means to automatically release'the first brake means and apply the second brake means to limit the return stroke of the tool holder.

29. In a mechanical tool apparatus, a re ciprocably mounted tool-holding member; a differential vgear mechanism; a drive element operatively connected to said mechanism; a driving connection between the differential mechanism andsaid tool holder to move the latter on a workingstroke; a drivingconnection between the diderential mechanism and the tool holder to move thelatter on a return stroke; brake means for controlling GOV said working stroke driving connection; brake means for controlling said return stroke driving connection; means for alternately operating said two brake means to cause reciprocation of the holder yby the differential mechanism and said connections; and means operated by the tool holder upon its return stroke to apply said second brake means and release said first brake means to limit the return stroke of the holder.

3(1). A power press comprising a reciprocable ram; a differential. gear mechanism; a

driving lconnection between one side of the nection between the opposite side of the dif- Vferential gear mechanism and the ram to move the ram on its return stroke;a brake to Vcontrolsaidworking stroke driving connection; a brake'to controlsaid` return stroke driving connection; a manually operable operating lever; operative connections between said lever and the brakes to release the first bra-ke and apply the second brake when the lever lis manually rocked in one direction and apply4 the first brake and release the second brake when the lever is rocked'in the opposite direction.; means to automatically rock the lever in said opposite direction when it is manually released; a. pivotedvmember rockable byv theV ram upon 'its return stroke; and an operative connection between lsaid'pivotedv member and said brake operating` connections to release the first brake and ,apply the second-brake to limitthe return strokeof the ram when `the pivoted member Vis rocked by the ram.

`In testimony whereof we `hereunto' affix our signatures this 9th day of December; 1927.

' ROBERT THOMSON.

ALFRED Monais TH'oMsoN;

ioo"

rio 

